Praise grown-up getting to grips with a charade at last (7)
I believe the answer is:
adulate
'praise' is the definition.
(I've seen this before)
'grown-up getting to grips with a charade at last' is the wordplay.
'grown up' becomes 'adult' (I've seen this before).
'getting to grips with' means one lot of letters goes inside another.
'at last' says to take the final letters.
The last letter of 'charade' is 'e'.
'adult' going around 'a' is 'adulat'.
'adulat'+'e'='ADULATE'
(Other definitions for adulate that I've seen before include "Flatter obsequiously" , "Praise excessively" , "Flatter excessively" , "Rave over" , "Worship" .)